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Method for one-step preparation of ceramic microfiltration membrane on basis of cross-linking reaction and product prepared by using same

A ceramic microfiltration and cross-linking reaction technology, applied in the field of ceramic membranes, can solve the problems of difficult control of membrane defects, increased separation resistance, low permeability of pure water, etc., and achieves controllable membrane thickness, good bonding, and simplification. The effect of craftsmanship

Active Publication Date: 2019-10-25
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this traditional preparation process, the transition layer will not only increase the separation resistance, but also the process is complicated and the defects of the film layer are difficult to control, and there are shortcomings such as uneven film layer, leakage of the separation layer, and low permeability of pure water.

Method used

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  • Method for one-step preparation of ceramic microfiltration membrane on basis of cross-linking reaction and product prepared by using same
  • Method for one-step preparation of ceramic microfiltration membrane on basis of cross-linking reaction and product prepared by using same
  • Method for one-step preparation of ceramic microfiltration membrane on basis of cross-linking reaction and product prepared by using same

Examples

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Embodiment 1

[0028] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0029] (1) Preparation of separation membrane coating solution

[0030] The raw material composition of the separation membrane coating solution is: α-Al with a particle size D50 of 0.2 μm 2 o 3 25wt% powder, 30wt% PVA solution with a concentration of 12%, 45w% water, and dispersant DOLAPIX CE64 in an amount of 0.2wt% of the total amount of the above composition; first add the above dispersant to water, and then add α-Al 2 o 3 After the powder forms a mixed liquid, ultrasonically disperse for 1 h; then add the above PVA solution at room temperature to form a suspension; disperse the suspension by ball milling for 5 h to obtain a separation membrane coating liquid;

[0031] (2) Support body pretreatment

[0032] Immerse the flat ceramic membrane support body in a borax solution with a concentration of 0.5% for 2 seco...

Embodiment 2

[0037] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0038] (1) Preparation of separation membrane coating solution

[0039] The raw material composition of the separation membrane coating solution is: α-Al with a particle size D50 of 0.3 μm 2 o 3 20wt% powder, 30wt% PVA solution with a concentration of 12%, 50w% water, and the dispersant DOLAPIX CE64 in an amount of 0.3wt% of the total amount of the above composition; first add the above dispersant to the water, and then add α-Al 2 o 3 After the powder forms a mixed liquid, ultrasonically disperse for 2 hours; then add the above PVA solution at room temperature to form a suspension; disperse the suspension by ball milling for 3 hours to obtain a separation membrane coating liquid;

[0040] (2) Support body pretreatment

[0041] Immerse the flat ceramic membrane support body in a borax solution with a concentration of...

Embodiment 3

[0045] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0046] (1) Preparation of separation membrane coating solution

[0047] The raw material composition of the separation membrane coating solution is: ZrO with a particle size D50 of 0.4 μm 230wt% powder, 25wt% PVA solution with a concentration of 12%, 45w% water, and dispersant DOLAPIX CE 64 in an amount of 0.1wt% of the total amount of the above composition; first add the above dispersant to water, then add ZrO 2 After the powder forms a mixed liquid, ultrasonically disperse for 1.5 hours; then add the above PVA solution at room temperature to form a suspension; disperse the suspension by ball milling for 4 hours to obtain a separation membrane coating liquid;

[0048] (2) Support body pretreatment

[0049] Immerse the flat ceramic membrane support body in a borax solution with a concentration of 1% for 2 seconds, tak...

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Abstract

The invention discloses a method for one-step preparation of a ceramic microfiltration membrane on the basis of a cross-linking reaction. The method comprises the following steps: preparing a separation membrane coating liquid by using metal oxide powder and PVA as raw materials, and immersing a support body into a borax solution for pretreatment; immersing a pretreated support body into the separation membrane coating liquid in a one-time dip coating manner, and directly allowing a separation membrane layer to be covered on the support body with a large pore diameter through the cross-linkingaction of the PVA and borax so as to prepare the ceramic microfiltration membrane. In addition, the invention also discloses a product prepared by utilizing the preparation method provided by the invention. The method provided by the invention has the following advantages: a preparation process is simplified; meanwhile, a membrane layer has high flatness; problems like nonuniform membrane thickness caused by a plurality of times of coating in the prior art are well solved; meanwhile, the performances of the ceramic microfiltration membrane are effectively improved; and the ceramic microfiltration membrane can be extensively applied to the industries of oil and water separation, sewage treatment, etc.

Description

technical field [0001] The invention relates to the technical field of ceramic membranes, in particular to a method for preparing a ceramic microfiltration membrane and a product thereof. Background technique [0002] Separation membrane is considered as a new separation technology with high efficiency and energy saving. The basic principle is that according to a certain range of membrane pore size, the pressure difference on both sides of the membrane is used as the driving force, and the membrane is used as the filter medium. Under a certain pressure, when the feed liquid flows through the surface of the membrane, only water, inorganic salts, etc. Small molecular substances pass through the membrane to prevent the passage of large molecular substances such as suspended solids and glue in water, so as to achieve the purpose of separation and purification. At present, the ceramic membrane in the prior art usually consists of three layers: a support body, a transition layer,...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D69/10B01D67/00
CPCB01D71/38B01D69/10B01D67/0079
Inventor 汪永清张利剑常启兵张小珍胡学兵徐泽跃
Owner JINGDEZHEN CERAMIC INSTITUTE
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